If you've got low grip carpet then foams are the sensible choice, so much easier to generate the grip needed.
Generally all sanctioned touring car racing is on rubber tyres these days, thanks to strict rules limiting them to one choice of tyre and the number of tyres used. No longer do racers have to take a suitcase full of rubber tyres with them to ensure they have the best tyre and fresh tyres for each race. Modern chassis are also a lot more flexible than they used to be and are fitted with a front spool, both changes counteract the disadvantage rubber tyres have compared to foams, making modern touring cars harder to drive on foam tyres.
Just because foams on touring cars isn't popular in the UK any more doesn't mean the rest of the world is the same. There are still several options, for example Enetti and Ufra make bigger ranges of preglued foam touring car tyres, with quite different wheels as well, than Schumacher, but they are harder to get hold of.
As for buying your own donuts, that died off with the advent of factory automated tyre gluing, when it costs less to buy ready mounted and trued wheel and tyre than buying them separately you don't have much demand for donuts. Schumacher still sells donuts as they are used for 1/8 stock cars, they can be used on touring car wheels as well.
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